Al-Nawawi

"The isnad (chain) is part of the religion: had it not been for the isnad, whoever wished to would have said whatever he liked ... ". 

It is important to establish the relevance of the Sunnah (Prophetic examples) in the understanding of Fiqh (law). The Sunnah re-emphasizes and reiterates the injunction of the Qur’an. We know the HOWs,  now we need to learn the WHYs.